CBS 91, 14-15 (2003). HPTLC of hawthorn extract on silica gel with ethyl acetate - methanol - water - formic acid 50:2:3:6, of passion flower extract on silica gel with tetrahydrofuran - toluene - formic acid - water 16:8:2:1, and of chrysine on RP-18 W phase with tetrahydrofuran - methanol - water - formic acid 4:6:14:1. Detection by dipping the warm plate in natural products reagent (0.5 % in ethyl acetate) followed by dipping in PEG 400 solution (5 % in dichloromethane). Visual evaluation at 366 nm.

J. AOAC Int. 86, 909-915 (2003). In quality control and stability testing of herbal medicinal products, fingerprint chomatograms are used as powerful tools to evaluate and compare the composition of compounds in such products. To fulfill the ICH- and GMP-based regulatory requirements in pharmaceutical QC, chromatographic fingerprint analysis needs to be validated. By considering the stationary phase, sample application, developing solvents, chromatogram development, plate labeling, derivatization, documentation, and chromatographic equipment the paper provides a comprehensive concept for evaluating validation parameters for planar chromatographic fingerprinting based on a standardized methodology. Validation parameters addressed include stability of the analyte, selectivity, robustness testing, and method reproducibility.

Chinese J. Trad. Patent Med. (Zhongchengyao) 26 (2), 113-115 (2004). TLC of Qirong medicinal wine on silica gel with 1) n-hexane - ethyl acetate 4:1; 2) petroleum ether (30-60 ºC) - ethyl acetate - formic acid 15:5:1; 3) chloroform - methanol 9:1; 4) ethyl acetate - acetone - formic acid - water 5:5:1:1. Detection 1) under UV 365 nm, and by spraying with 5 % KOH in methanol and under UV 365 nm. Identification by fingerprint techniques. Quantification of psoralen and isopsoralen by HPLC.

Br. using gymnestrogenin as reference. Indian J. Pharm. Sci. 66 (2), 242-244 (2004). HPTLC of gymnestrogenin in Gymnema sylvestre on silica gel with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 293 nm. Linearity was in the range of 4-10 µg. A gymnestrogenin content of 1.11 % was found in the test sample. Average percentage recovery was 99.1 ±0.27. The proposed method is precise and sensitive and can be used for detection, monitoring, and quantification of gymnestrogenin in Gymnema sylvestre.

Chinese J. Trad. Patent Med. (Zhongchengyao) 26 (4), 341-343 (2004). TLC of Changchun Hongyao capsule extracts on silica gel with n-hexane - ethyl acetate 1:1. Detection by spraying with 5 % solution of potassium iodobismuthate. Identification by fingerprint techniques. Quantification of aconitine by HPLC.

IPC 56th 2004, Abstract No. G-28. Neem Oil obtained from the seed kernels of Azardirachla indica (Meliaceae) is a fixed oil known as oil of Margosa. An HPTLC method is reported for the analysis of Neem oil as a bulk drug and formulations containing oil. TLC of neem oil extracted with chloroform, on silica gel with chloroform - n-hexane - methanol 18:2:1. Quantitative determination by scanning at 254 nm. The linearity range was 100 – 500 mg/mL. Formulations were found to contain 0.35 g/g of Neem Oil.

Chinese J. Trad. Pat. Med. (Zhongchengyao) 27(2), 158-161 (2005). HPTLC on silica gel with 1) cyclo-hexane - ethyl acetate - methanol 4:5:1; 2) n-hexane - ethyl acetate 3:1; 3) n-hexane - ethyl acetate 9:1; 4) cyclohexane - ethyl acetate - diethylamine 45:20:3. Detection 1) under UV 365 nm; 2) by spraying with 10 % H2SO4 in ethanol and heating; 3) by spraying with diluted potassium iodobismuthate solution followed by spraying with sodium nitrite solution in ethanol. Identification by fingerprint technique. Semi-quantitative determination of aconitine by comparison with the standard. Quantification of strychnine by HPLC. The results for some real life samples are given.

IPC 56th 2004, Abstract No. GP-15. Stability indicating HPTLC determination of ondansetron in solid oral dosage forms on silica gel with chloroform - methanol 4:1. Quantitative determination by scanning at 310 nm. The Rf value was 0.62 - 0.64, linearity was 40 - 120 ng. The average recovery was 100.01 %. The method was found suitable for routine analysis of formulations containing ondansetron.